SCA3000-E05
Data Sheet
SCA3000-E05 3-AXIS ULTRA LOW POWER ACCELEROMETER
WITH DIGITAL SPI INTERFACE
Applications
Features
•
•
•
•
•
•
•
•
•
•
•
2.35 V – 3.6 V supply voltage,
1.7 – 3.6 V digital I/O voltage
±18 g measurement range
SPI digital interface
Selectable frequency response
Ultra low power consumption
(2.5 V, 120 µA typ)
64 samples/axis buffer memory for output
acceleration data and advanced features
enable significant power and resource
savings at system level
Interrupt signal triggered by motion
Size 7x7x1.8 mm
Proven capacitive 3D-MEMS technology
High shock durability
RoHS compliant / lead free soldering
C/V
Oscillator
&
clock
Reference
Analog
calibration
&
ADC
DEMUX
1:3
Non-Volatile
Memory
SCA3000-E05 is targeted to battery operated
wrist and hand-held devices. Typical
applications are but not limited
• Sports equipment
Low-pass
Filter
Decimation
Low-pass
Filter
Decimation
Low-pass
Filter
Decimation
Motion
detector
SCK
Coordinate
Mapping
and
Calibration
SPI
i/f
MISO
MOSI
CSB
Free fall
detector
Ring
Buffer
Control
&
INT
INT
Figure 1 SCA3000-E05 Block Diagram
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc. Nr. 8269100A
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Rev.A
SCA3000-E05
Performance Characteristics 1)
Parameter
Analog and digital Vdd
Digital I/O Vdd
Operating temperature **
Current consumption *
Acceleration range * 4)
Offset calibration error *
Offset temperature error ** 5)
Sensitivity * 6)
Sensitivity calibration error *
Sensitivity temperature error
** 7)
Non-Linearity ** 8)
Cross-Axis sensitivity ** 9)
10)
Bandwidth **
Noise ** 11)
Output data rate **
Turn on time ** 12)
Output load **
SPI clock rate **
*
**
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Condition
Vdd ≥ Digital I/O Vdd
Reset 3)
Active
Motion Detection
mode
Nominal
Z-axis +1g position
-40 ... +85 °C
-40 ... +85 °C
Measurement mode
Narrow band
measurement mode
Wide band
measurement mode
Measurement mode
Narrow band
measurement mode
Wide band
measurement mode
Measurement mode
Narrow band
measurement mode
Wide band
measurement mode
Measurement mode
Narrow band
measurement mode
Wide band
measurement mode
Typical supply range
2.35 – 2.7 V
Min
Typ 2)
Max
Extended supply
range 2.7 – 3.6 V
Min Typ 2)
Max
2.35
1.7
-40
-
2.5
1.8 / 2.5
<7
120
120
2.7
2.7
85
-40
-
3.3
3.3
<9
150
150
85
-
V
V
°C
µA
µA
µA
-18
-300
-5
-
±3.0
160
±0.015
18
300
-
± 18
± 500
±3.0
160
±5
±0.015
-
g
mg
mg/°C
Count/g
%
%/°C
45
7
±3
±4
60
9
75
11
-
±3
±4
60
9
-
% FS
%
Hz
Hz
50
75
100
-
70
-
Hz
-
50
22
-
50
22
-
mg RMS
mg RMS
-
65
-
65
-
mg RMS
160
40
200
50
240
60
-
200
45
-
Hz
Hz
320
400
480
-
400
-
Hz
-
30
200
-
30
200
-
ms
ms
-
20
-
20
-
ms
-
-
-
-
35
325
pF
kHz
+5
35
325
Units
100% tested in production
Qualified during product validation
The product is factory calibrated at 2.5 V in room temperature.
Typical values are not guaranteed.
Includes the current through the internal 400 kΩ pull-up resistor connected to digital I/O Vdd.
Range defined as x 2+ y 2+ z 2 ≤ 18g . The measuring range is tested on sensing element level. FS = 18g.
Offset temperature error = {Count(0g)-Offset} / Sensitivity [ g ]. Sensitivity = Calibrated sensitivity.
Offset= Calibrated offset.
Sensitivity = {Count(+1g) - Count(-1g)}/2 [Count/g].
Sensitivity temperature error = {[Count(+1g)-Count(-1g)]/2 - Sensitivity} / Sensitivity x 100% [%].
Sensitivity = Calibrated sensitivity.
From straight line through sensitivity calibration (+1g, -1g) points.
The cross-axis sensitivity determines how much acceleration, perpendicular to the measuring axis, couples to
the output. The total cross-axis sensitivity is the geometric sum of the sensitivities of the two axes which are
perpendicular to the measuring axis. The angular alignment error between X, Y and Z axis is included into the
cross axis sensitivity.
Frequency responses according to Figure 3, Figure 4 and Figure 5.
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc. Nr. 8269100A
2/4
Rev.A
SCA3000-E05
11)
12)
Average noise/axis over the measurement bandwidth defined as 1 (n 2 + n 2 + n 2 ) , where nx, ny and nz are
y
z
3 x
the measured signal's standard deviation due to noise in x, y and z directions.
Settling error less than 1% of FS.
Z
X
Y
Figure 2 Sensing directions and package dimensions in mm with ±50 µm tolerance.
Figure 3 Frequency response of SCA3000-E05 in
measurement mode
Figure 4 Frequency response of SCA3000-E05 in
narrow band measurement mode
Figure 5 Frequency response of SCA3000-E05 in
wide band measurement mode
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc. Nr. 8269100A
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Rev.A
SCA3000-E05
Figure 6 Application schematic
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Name
NC
XRESET
INT
CLK
DVSS
DVDD
DVIO
CSB
NC
NC
SCK_SCL
MISO_SDA
MOSI
AVDD
AVSS
AVSS
ATSTIO
NC
Function
Not connected
External reset, active low
Interrupt output
Digital ground
Digital ground
Digital supply
Digital I/O supply
Chip select
Not connected
Not connected
SPI serial clock (SCK)
SPI data out (MISO)
SPI data in (MOSI)
Analog supply
Analog ground
Analog ground
Not connected
Not connected
Table 1 Pin descriptions
Document Change Control
Rev.
0.1
0.2
0.3
Date
11-Aug-06
26-Oct-06
04-Jan-07
A
08-Feb-07
VTI Technologies Oy
www.vti.fi
Change Description
First version
Frequency responses updated
Offset and sensitivity temperature dependencies updated. Turn-on time and noise
characteristics added.
1st official release
PRELIMINARY - Subject to changes
Doc. Nr. 8269100A
4/4
Rev.A